linux-kernel - Re: [PATCH 16/20] sched/idle: Use explicit broadcast oneshot control function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 28 Apr 2015 11:17:51 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	Sudeep Holla <sudeep.holla@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 16/20] sched/idle: Use explicit broadcast oneshot control
 function



On 28/04/15 11:11, Linus Walleij wrote:
> On Thu, Apr 2, 2015 at 12:22 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
>> From: Thomas Gleixner <tglx@...utronix.de>
>>
>> Replace the clockevents_notify() call with an explicit function call.
>>
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> For some reason this makes my Ux500 system arbitrarily hang,
> especially during boot. Bisected down to this commit.
> Since the entire changeset is removing the notifications
> altogether I can't just revert it.
>
> Disabling CONFIG_CPU_IDLE removes the problem.
>
> Tried registering a stub driver (I just #if 0 all the code in
> drivers/cpuidle/cpuidle-ux500.c) it still crashes.
>
> That makes me think something inside the cpuidle subsystem
> is locking up after this, but my other idea is that the timer
> may be involved in some way, like this is stressing the timer
> in some new yet untested way.
>
> Has anyone else seen problems with this or is it only
> ux500?
>
> I'm looking closer at it but feel a bit clueless...
>

Yes I am too in similar situation with my Vexpress platform.
I did report with the lockdep logs[1] before v4.1-rc1.
I still see the issue with v4.1-rc1.

Regards,
Sudeep

[1] https://lkml.org/lkml/2015/4/23/329
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/